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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03569976b15cff54b2b38bba1dc6efeb5bb75a523bded8312307489d92789bb9' 
  AND token = 'b2mphfTZEDgs9MY+sOmL+uyPvOFbU8PlKDPOfEem7gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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