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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23d883ee54181f246499ddc00d04b4a336686d49f6b11c58d62805d07b3fd575' 
  AND token = 'JEFyDOaecD/XH1rK52yL0OTh8XDFYV7nBBjjO7tE0Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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