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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc6f66d6095d9cca75f0dbfc142b81f1a68a3e86838a3470df5be42743a1e1ab' 
  AND token = 'jjEczLsCnWInw6sTY/8ILuO3LSwaLNGwvricrPTX1P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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