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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd2de6f9baf2c22aab6ea09e794c771a51047825fd72a098cf5aa79934ddeed' 
  AND token = 'nDz17CwFAS39THTl9AkgYsYXl1HrJhWldhVsd6XOaiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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