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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0414946c51c910501806baa5b16eec7c2c928e4fee4e26ed6d0113126ea6b9a8' 
  AND token = 'oqaT8AgKZEExNNMG37lmAJntmJiU+c/kf3mxZZhaJgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}