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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5832baae15bb5702e0115d2ff2e7984403ca235ff6f9a47c0fb6dacbf24445b6' 
  AND token = 'Nu5Hnz0xxJmvf1ikVng/sbwIitMgs2+GvCcGoRM35iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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