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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e8d01386fc72a6b798ee35ef92e0a7f6953700e0d225c5848750349a72f2e7d' 
  AND token = 'VMXIpmfSCnFtpLcIiQTyFusVOhCx+bPlZskkTuUn+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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