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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d8045cbd0120c49932f4b196195d333d93ff718bc847d6e863cba2213810c82' 
  AND token = '0YgDSi4YGefFOR7nJqLn7hqlY4pfu2XpoO3SB2JeqA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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