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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620f85a6d0b3ec2b52845c8e9a691cc69f2d4c67a85fc76469c03d580b24b856' 
  AND token = 'rvd9Tx9dgiTG1KvchjdQXEPHkEJaJ/jf4UcZQri1BrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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