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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f57f04ab4761d781688f81a9332b68236e8e3a661d774fe151a41b4e42757cd0' 
  AND token = 'eBAV6Z/tYvZOlbMtNdCJp4yaauMge7GuA08gofVN/Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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