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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3ad93e282e74984fd83b68e471ab0252efae2dec84d4ec2ce48fbe6bb93a95e' 
  AND token = 'iN4PEg4YadYgsR49Z2PtAYs8y25jOSqImJTqkyNdxeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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