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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f20a2ad9013208285a2fe3748897f8d54ade1c6ad38a7574ffcd3464ef6a5fa' 
  AND token = '7njq9bmE6lhVyQU13SUooMOBqCU+y4l8R2Nq/rCQC9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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