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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f95d8f3dacb70330d9f75eccce8eab87b7476486a77542d87fb727e8f657cf3e' 
  AND token = 'lBQRHEBtUnvsi9FrXHL6u7iBrg9nVvLeUKN6g6YRaZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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