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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '080447260d4079b24f40128d41cb278346d788a0f42dbc84ce12855feed368fe' 
  AND token = 'IgeWEy1xSWR+ftK4Fz4gC0fSu833TBP4vi0hDumjcLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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