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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7d8d8d2a7f0f2492574f5ac4b251ecd6306251fa0db10ce1423994b734f57bc' 
  AND token = 'qNP7AgAX/E4rNYPJMS9eQSAgzsyt2pQrlPSusCBy+S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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