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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158996bd21b6c5cc429b27babc86b4665e92575c3aaa552d40521f2b31a0f35a' 
  AND token = 'Wij5ub71gVs9CSVrBb++PdqzC3a0pxcOYyc9lJiummM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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