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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d4ff70f1a7a8cb130062f642b73de6cc2a3f16fff7e25ae3e3f34eef6651881' 
  AND token = 'cXir2IDVeboUoPH4oU9E58JoiMqyBCIFu2Xyz5+GWOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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