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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f43da82aadb73dfed325beaf8e9541d1df5b0de4c64cfb87b8466ea2159ef5a' 
  AND token = 'nGrByh8lopnWAhh93S26Rs6rAW+qaAiqCiAxQ2aLuRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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