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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4cbc86fef0d67fe3fef467d8aec19b63bef69621eed6bfc0db790023116e111' 
  AND token = '3Tl/OeAx5fHTiH2FyAn+F41UPl+R3yW0TQhSbqEKbJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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