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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be3270e57c1c73f1ed9bd44a5d9747c481a5d95ff8feba4517bdf19b5e00809b' 
  AND token = 'EX6yLk1z9UgYUovHhM6Ud3XCceofRIF+Au0FwjwPO3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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