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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcbb0c4fa9be3b6af2a1de2ec4c44fe4d21c3e2c21507d0f8994d9a50f8e7a5d' 
  AND token = '2C+HOnZiHhpBB5dvF2uX91UBR7FGmt2emuz9B1rh+40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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