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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7862ab710f77bdff6081b032a6a36f7e9aa5132c27c1bd7dbdfa174e4e54d56d' 
  AND token = '+2fcg4Tlw95qryZJeIuFGt9ojahl7d0Aw/RnpGS0lR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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