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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3655b5664ebcdd4d128e86729b02ddeab6d3e2b6b5a3dae3d639052ca9bf32c' 
  AND token = 'SWxRBOLQMEFdvS85LL8Oa0EE4PRlr1zEbzNvBrMonwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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