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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0adda24d0d25ce4f9fe9c0027c55bad7714c3111ecc07d748b0a9990bd192861' 
  AND token = 'NSDd4+DppGK1y5V01yA+Qm8SlJSlqYhjrIhMjD2PWwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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