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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2bc22b4ffbc59205ea773525e1c235bfbac64a3bc5fc3cb8b229e4145e73bb4' 
  AND token = 'Zy6oyzIMXgG7gGVOxxa63CBkPAK5bKvP0eZoTCJsjss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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