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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e164b21ec1981ac9a2ec74cfdbdd4a01a845e330ca2c0d4453b68d0e6ef1755' 
  AND token = 'ukOcbCvIyTRtslii/a4ydRD1zyuPCA2zaMzphftTm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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