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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f3897fa6a8bffb11020aa55b589b8cb33ece576f9182e81d6163de6984e0a1d' 
  AND token = 'H0c4hoheFq/8f0GCMfT85pvPZ+MTz+35ZR5f1AKaipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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