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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eff46525de1e7c029480aa2b4e0c9a386202d5048782110a279bab6b69e79bd4' 
  AND token = 'jSGhAfd5l/LMA+bH+Zbp/8749tXwmThmu4Mkzfxy0GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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