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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a8a29efd336eab18908a50edf98efa284edfe63b84e20bfecf3bd563d5d5c2a' 
  AND token = 'a59Dkp9DBgoUA49KTTyQFXp92H9sAat+MHbuam3kh7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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