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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20efc0f11ed02b5a7b84513703f4a3d94109d1b84e4fe9cdee77a6444ed015c' 
  AND token = 'j8MXr1kbaY1bC7qmW8hj09tpsjadSVyGpt9LFzjxyWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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