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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a59e186604a1ee9a126462a04b14a2b60e316545147e273e884dec4369189b0' 
  AND token = 'Q6rYcnlphGXQHwMrDBoE012rZUyNsE3v/iT2O5agIcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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