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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7670f585dbddec695753be6a30f990de636a9e794396ff3cfb0ec9716224e877' 
  AND token = 'gp4JclOtyRmQ1N1KuzaszI3twRrh402IdnkrFfuCgeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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