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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9a9810fc33ff46ed2a5fd4c26c34f22567844e7d040e27510310d84b28a3a11' 
  AND token = 'HhDp92NfYpXLQsOwHTbMCamESeF3rVPFGqoH0PwC83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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