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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd495fe6cb2eb889912889a963ef3efeb21e5e3dadb92b07dd3253069330990e' 
  AND token = 'KjCk0E3Ic1UA/GiiW1VUa9cAZSIDb4s6LDOmns/KKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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