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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc7126e30b0164619d4ddcc71fc82fa4bbd5e09b828f4a4cc4195b9b0ffac6bf' 
  AND token = 'knTNe1OoWDgvnqAK0aSatJwciQoctJ/HW0zSVkbX0Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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