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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab640e431202a41d784fe44da3cbb1e9075246eb6f0f2837f4795955945cdb15' 
  AND token = 'ivwUiAwhace4h0lls4Sh0kLCc9pdEj1XyXDXwm/osbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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