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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9e62c8d86fb8994eda5203a09eeb2c31af974d97a002a9da56f313ef95fdc4e' 
  AND token = 'jwIJQfgWrXPKtT5P4fmJeJET1u+wjKVDsdcKygwY6O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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