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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9408c35b945d32e0dbca7d0902f23d44bb034f536a41e02e2b1252608bcc8dd' 
  AND token = 'm38/vOyg+ZAcPqRkCeEpU+hfkHO9h5ZjTl2hQpPSJM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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