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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a67cd37369e3d73b72c5264a2603a58a8d64baf2f8c527f88ef6c1a3a3a77d4' 
  AND token = '2TRW1KYsUU5ZQYSFhKK9308CCNRmv8OrbCXB+dCc2n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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