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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f70d9ba7363a7ca56bbef31b1ef78f1d6612b692b3d987f57900920134ed81' 
  AND token = 'uBDArXSglryrgftVmB9HPeudSixBX9MnLZZ/XHPdpZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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