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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc4092d0d71da59a0da4cbf13325902a96e30097abceae3caab24886b14a8750' 
  AND token = 'C6taDreZamlCQ4Gm7klKxxilD7qNgodyN9PHrWXaaXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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