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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b80939c22b7abc7712721b7b2b39cc7dec31c9695beb27cdfcd9e5a181b1eed2' 
  AND token = '+aWylU++oSC7yvzqMvQMllBkJwlF9Hu8Agc971IjEvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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