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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0436c73797ebde33dc76c05e620a64ab72e8b052e3fd4d63ce92c7ad04ab26' 
  AND token = '9dj2AlQYl01XlSBSD7NIGlvmQK6w8pMhuEPCGjH3DA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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