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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76796a94c5973ec47e4a5ad637ea38f12ce8ad1046fcd6872d9c8fb390a938bb' 
  AND token = 'iXxsOIiyH+n0izDwzpLxT6SfmOEGYOomikmGTC4KGC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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