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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83ef4be5b07944e2bff96eef6b43758cd6a2e280e32f70071d3abf7af5eaa953' 
  AND token = 'fvV1OQiGzNqiQk8tt/X0OlfHzHbUDoklkHGu/ve2H+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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