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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '416025c893ce5859c6637f808e6306a5e64e6e301e93edcc8186336d5135ff1c' 
  AND token = 'BgOuhYr1t+zRqmwOtOsuHB3ID1QTmYwRBLXcjzEq6HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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