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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '448e8b9c60d6a0e9ae86dd3e7035481dafeeb977a3e25a09468b579b16050ee4' 
  AND token = 'GKb3sJ8MEVQymKlpdVDeHo8qDslpDrO6dJu0NK061GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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