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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27d23a879a0db3b0c84eaa577458bb4a637d5efe679ba6a583f26c16c9895269' 
  AND token = '2HMIe8ABrgH61QGgsZL8kaPxPc7xEQetHb+0Q1xIakQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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