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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab82a7f8e237ebfa0df6a45f5e7bb1753b31bf849a2dbf8db4f7231cad9dc7e7' 
  AND token = 'f1v12g90/wFWQAeWtrSqb6KsSYO+0F5Q2mRBpMKZyT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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