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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffc658b573a8e00e62bb7ef5a0fc8578c3266e67c64765e2239ef6f15cfde175' 
  AND token = '7SBN33sX1MMgTRe3eNvQtTspQG/sFi7fbPHR4MALBbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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