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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3bee3235af6a61ef196018421c0e3ca3814b397ceb1ec8a58ae77884108c18' 
  AND token = 'dk/ETRG/tNg4Fcgk31FnEGE52g9kXf2XVJowY3FvfOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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