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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b382211592edfba9b732f82a3537681b664cd7acada6d215c03a8b00d2d88729' 
  AND token = 'L8bU9jJoSqOPs2MrwAwp1nNRLRqlQVel3l7nQ41C91A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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