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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc8f90fdfaa86804ee4c1110456ac0d342171d0244d86af5ed5c6ed88c16832' 
  AND token = 'vYMkcD2ZHd1Npi+LbXi9mlxmQEd9AnO1mVzfU6Ug7zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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