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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb08712810f817f13a51d05b8cc7c2ea94d30efb0b75e61023107cc798d6af5f' 
  AND token = 'ewRGKb38Zpy+v8RK3iWUHSKZA1+lT3E/sAPdBpBO0cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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