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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c70b892608df43a4c51c0642f3367ae4b3544ebceaeebecaa4823a48f0b3a51e' 
  AND token = '/DlaCizPRZzB9V75TC7+48/OQNo+sZSJiUotYR43E/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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